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TriLink BioTechnologies公司是世界的核酸修飾技術(shù)領(lǐng)域的，成立于1996年，總部設(shè)在San Diego，California。TriLink公司致力于高品質(zhì)核酸修飾產(chǎn)品的研發(fā)和生產(chǎn)，提供包括核苷酸、常規(guī)及核苷三磷酸特殊修飾的寡核苷酸定制（oligonucleotides），m RNA合成，CleanAmp?PCR產(chǎn)品，phosphoramidites和其他小分子在內(nèi)的眾多產(chǎn)品。近二十年來，TriLink一直是診斷和OEM市場核酸產(chǎn)品供應(yīng)的行業(yè)，產(chǎn)品應(yīng)用于基因治療，核苷類化療，寡核苷酸治療和診斷領(lǐng)域。此外，TriLink還可提供特殊核苷酸、m RNA定制，合同研究服務(wù)和ISO/ QSR標(biāo)準(zhǔn)的cGMP生產(chǎn)設(shè)施。TriLink完善的產(chǎn)品及研發(fā)服務(wù)解決方案有助于推動藥物發(fā)現(xiàn)和生物醫(yī)學(xué)研究。

經(jīng)過18年的發(fā)展， TriLink已經(jīng)成為高品質(zhì)RNA合成領(lǐng)域的，為廣大科研工作者提供的mRNA及長鏈RNA（長可達(dá)幾個(gè)Kb），并且定制修飾。同時(shí)我們也提供成品mRNA產(chǎn)品，包括報(bào)告基因及 mRNA表達(dá)因子。

N-6001
Guanosine-3',5'-bisdiphosphate
ppGpp, Magic Spot, Guanosine tetraphosphate 


 

Extinction Coefficient: 13,600 Lmol^-1cm^-1 at 252 nm
Molecular Weight: 603.2 g/mol (free acid)
Molecular Formula: C₁₀H₁₇N₅O₁₇P₄ (free acid)
Salt Form: Lithium
Purity Specification: ≥85% by AX-HPLC

Shipped at 100 mM in H2O.
1 µmole: 10 µL
5 µmole: 50 µL
10 µmole: 100 µL

Guanosine-3',5'-Bisdiphosphate (also known as guanosine tetraphosphate, ppGpp or “magic spot*”), is a guanosine analogue containing a diphosphate moiety at both the 5' and 3' hydroxyls. Within the cell, ppGpp regulates transcription of genes affecting important bacterial metabolic processes, such as cell division, motility and adaptation (Potrykus, K., et al., Lemke, J.J., et al.) When prokaryotes and certain plants become nutritionally deficient, amino acid starvation is a direct consequence. During amino acid starvation, guanosine tetraphosphate is an important signal to start the stringent response mechanism. The result of the ppGpp signal is a stop in protein synthesis, leading to adjustments in gene expression levels and causing cells to remain dormant until normal nutritional levels are restored (Artsimovitch, I., et al.) In particular, ppGpp strongly inhibits the synthesis of components of the translation machinery such as tRNA and rRNA (Paul, B.J., et al., Gralla, J.D., et al.) while simultaneously stimulating the transcription of genes involved in amino acid biosynthesis (Artsimovitch, I., et al.). This ppGpp-mediated mechanism prevents the outflow of unnecessary energy resources to help bacteria survive until adequate amino acid levels are reached.

Guanosine tetraphosphate is synthesized from ATP and GDP during the stringent response mechanism (Figure 1). The RelA and SpoT proteins play a critical role in maintaining the appropriate levels of ppGpp (reviewed in (Potrykus, K., et al.)). Once synthesized, the ppGpp transcription factor binds to the RNA polymerase (Vrentas, C.E., et al.) to regulate the transcription of certain promoters in a process that, in E. coli, is assisted by protein DksA, Figure 2 (Paul, B.J., et al.). In the presence of ppGpp, tRNA and rRNA synthesis is reduced in favor of transcription of amino acid biosynthetic genes. Although the global role of ppGpp is understood, the mechanism by which ppGpp contributes to the regulation of certain promoters has not been fully characterized and varies among different bacteria (Bernardo, L.M., et al.) Molecular mechanisms of ppGpp are still being studied to better understand how different bacteria adapt to extreme circumstances through the stringent response.

While ppGpp plays a critical role in cellular survival in vivo, several groups have contributed to our current knowledge of how guanosine tetraphosphate interacts with the RNA polymerase and other transcription factors by in vitro experiments (Lemke, J.J., Vrentas, C.E., Powell, B.S., deLivron, M.A. et al.). Most notably, Richard Gourse’s laboratory at the University of Wisconsin focuses on understanding RNA transcription regulation and the role that ppGpp plays in modulating the response to changing environmental conditions. A well-characterized transcription assay to examine the effects of added ppGpp concentration on promoter activity during in vitro transcription is described in Paul et al. Herein, we provide some general guidelines to follow in any in vitro transcription assay in which the amount of ppGpp is varied to evaluate its effect on the cellular stringent response.

* Potrykus and Cashel noted two spots appeared in autoradiograms from extracts of E. coliresponding to the stress of aminoacid starvation. According to Irina Artsimovitch of Ohio State University, these spots were tagged as 'magic' because “Microbiologists have wondered for half-century how this small molecule with a relatively simple structure could have such a profound effect on regulating a cell’s survival.”

Basic experimental parameters for an in vitro transcription assay using ppGpp: 

This assay is a basic tool for the study of ppGpp in cell metabolic aspects that are sensitive to changes in the nutrient availability. One of Dr. Gourse’s basic protocols described in Schneider et al. involves the preparation of a reaction mixture that combines the appropriate reaction buffer, a DNA template (supercoiled plasmid or linear), an unbalanced pool of NTPs (where the concentration of UTP is very low), and the RNA polymerase of interest in the presence or absence of ppGpp. The transcription reaction is then incubated for the appropriate time and at the appropriate temperature, quenched using an EDTA and formamide solution, and analyzed by polyacrylamide gel electrophoresis to determine transcription yield. Other notable variations on this protocol have also been described in Krásný and Gourse, Vrentras et al., Paul et al., Carmona et al., and Bernardo et al. 

產(chǎn)品編號	產(chǎn)品名稱	規(guī)格	生產(chǎn)廠家
N-6001-1	ppGpp	1umole	trilink

TriLink N-6001 大量現(xiàn)貨

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